How to code a query to connect to my server if I am using diferent devices with public ip

I have a server in which I use this string to connect: string Cadena = "Server=10.10.10.10;Port=3306;Database=base;Uid=usuario;Pwd=pass;default command timeout=20000;Pooling=false;"; I want to connect to my server using a public ip like this way string Cadena = "Server=11.11.11.11;Port=3306;Database=base;Uid=usuario;Pwd=pass;default command timeout=20000;Pooling=false;"; I just want to see if there are options to do it. It is not transferring data and I do not want to use a VPN but if it is the only way to do it, I will have to. So, please give me ideas, what to search or something. Thanks!!